Electrical isolation room



Nov. 9, 1965 NVENTOR: ERIK A. LINDGREN ATT'Y Nov. 9, 1965 INVE: ERIK A.LINDGREN Nov. 9, 1965 E. A. LINDGREN 3217,085

ELEGTRICAL ISOLATION BOOM Filed Aug. 31 1964 4 Sheecs-Sheet 3 INVENTOR.

ERIK A. LINDGREN N 1965 E. A. LINDGREN ELEC'I'RICAL ISOLATION BOOM 4SheetsSheet 4 Filed Aug. 31, 1964 m mm W.nK

D mm L A M R E United States Patent O 3,217085 ELECTRICAL ISOLATION ROOMErik A. Lindgren, 4515 N. Ravenswood Ave., Chicago, III. Filed Aug. 31,1964, Sex. N0. 406,953 12 Claims. (C1. 17435) This application is acontinuation-in-part f my copending application Serial N0. 172,670fi1'ed February 12, 1962, now abandoned, and Serial N0. 223,788 filedSept. 14, 1962, now abandoned.

This invention relates in general to an electrically shielded enc1osureoften referred to as an isolation room for protection from highfrequency wave ernanations and magnetic fields and relates in particularto the panel configuration and the se ':nring n1eans for holding theadjacent panels of a portable prefabricated installation togetherwhereby the entire isolation room may be readily assembled anddisassembled entirely within the room with a mim'rnum of eflort withoutloss 0f the desired shieldin g effectiveness.

Shielding efii-ciency is related to conductivity and nonpermeability andit is known that continnous electrical conductivity between -contiguouspoints in a shielding element aifords a pronounced eificiency shield inthe intermediate and lower wave bands.

Isolation rooms are prirnarily used'in laboratories and in other .p1aoeswhere various type-s of test-s are perforrned upon electrical equipment,for example, radio interference measurements, radio frequencycalibrations, testing equi;iment for measuring minute voltages andtesting of various other electronic devices and appliances. The purposeof such encl-osures or isolation rooms is to intercept and dissipatestray electromagnetic and electrostatic waves which would otherwise bethe cause cf serious disruption of the testing of the devices.

In the pa-st, isolation rooms have taken one of three standard forms.Either as a -single-shielded structure wherein a single sheet ofmaterial having a substantially planar surface is utilized for theinterference dissipation; as a double-shielded enclosure wherein a pairof shielded sheets of material are spaced apart and insulated from oneanother for dissipation of higher wave emanations; and a-s the cell-typestructure wherein doublvshielded structnres are conductively coupled toone another to form a contin-uous surface for the desired interferencedissipation.

The isolation room of this invention relates prirnarily to the -singleshield type and i-s formed from a plurality of prefabricated panels in amanner to per-mit various size rooms to be constructed. The panel-sprovide a semirigid overall structure with the members utilized for thestructure.

Formation of an isolation room fron1 a plurality of prefabricated panelsi-s well known in the art as well as the f0rrnation of an isolation roomof the single shield ty-pe. This invention is an improvement ovdr thegeometrical relationship and configuration of prefabricated panels andthe connecting devi-ces of the prior art permitting complete assembly ofthe room frorn one side of the panels to provide a more eflective,portable isolation room for protection fr=orn high frequency waveemanatins and magnetic fields.

In recognition of the desired objects and factors of an isolation room,it is the princi-pal object of this invention to provide an improvedprefabricated multi-panel isolation room construction utilizing singleshields of a metallic material in which continuity of conduction betweencontiguous panels is established by the panel connecting devices.

A specific object of this invention is to provide an im- 3,217,085Patented Nov. 9, 1965 proved connecting device for releasably securingprefabricated panels of a single shield material t0 form an isolationroom whereby continuity of conduction between the adjacent panels isrnaintaine-d.

Another object of this invention is to provide an improved connectingdevice for securing adjacent prefabricated panels of an electricallyisolated room which permits assembly and disassembly of the panelsentirely from one side of the panel-s.

A further object of this invention is to provide an improved-connecting=device for securing adjacent prefabricated panels of anelectrically isolated shield room which readily permits assel'nblj; anddisas-sernbly of the panels in close quarter=s prefrably from within theroom without loss or injury of the shielding effecveness.

Another object of this invention is to provide an improved panelcon-struction formed from a unitary piece of shielding material.

A still further object of this invention is to provide an improveddemountable isolation room forrned from three ba-sic prefa-bricatedtypes of panels which rnay be interconnectod to form an isolation roomof any desired size.

The features of the present invention which are believed to be novel are-set forth with particularity in the appended clairns. The geometricalrelationship and the manner of formation' of the invention, togetherwith further objects and advantages thereof, may best be nnderstood byreference to the following description taken in connection With theaccornpanying drawings in which, like reference numerals identify likeelements, and in which:

FIG. 1 is a perspective view in front elevation illustrating anisolation room formed from panels embodying the invention, the threedifferent basic panels being labeled A, B and C;

FIG. 2 is a fragmentary exploded perspective view in front elevation ofthe three basic or standard prefabricated panels, A, B and C utilized toform an isolation room;

FIG. 2a is a fragmentary sectional side elevational view of thehoneycornb structure utilized in the panel construction;

FIG. 3 is a fragmentary exploded view in front perspective showing therelationshjp of the three ba-sic pane1 types and connecting mernbers ata three panel corner juncture of an isolation room;

FIG. 4 is a fragmentary partially sectioned view taken along the lines44 of FIG. l;

FIG. 5 is a perspective view in front elevation illustrating anisolation room formed from the panels of this invention and ernbodyingthe preferred form of the invention, the three different basic panelsbeing labeled A, B and C;

FIG. 6 is a fragmentary exploded perspective view in front elevationillustrating the assembled relationship of the three basicprefabri-cated panels, A, B and C utilized to form an isolation room;

FIG. 7 is a fragmentary partially sectioned view taken along the lines77 0f FIG. 5;

FIG. 8 is a fragmentary front perspective view illustrating thesecurernent of two adjacent panels;

FIG. 9 is a fragmentary partially cutaway freut perspective view showingthe relationship of the three basic panels and connecting me-rnbers at athree panel corner juncture of an isolation room; and

FIG. 10 is a fragmentary perspective view in front elevationillustrating a reinforcing member securod on the planar surface of oneof the panels.

Sinoe the purpose of the invention is to provide a prefabri-cated,rnnlti-panel isolation room formed from single shielded panels of threebasic types, the particular features of this invention, for which patentis claimed, resides in the novel panel con-strucon and the fastening ofthe marginal edges of the panels which, when connected, automaticallyattains continuity of electrical conduction between the several panelsforming an electrically isolated room.

Referring now to the drawings, in which like numerals refer to likeparts, and specifically toFIGS. 1 and 2, an isolation room 10 isconstructed from three basic or standard prefabricated panel types A, Band C. As best seen in FIG. 2, the panels A, B and C are substantiallyidentical in configuration, varying only in the positioning andrelationship of extending lip portions.

The panels A, B and C are preferably formed from a solid metallic sheetmaterial, such as 24 ounce copper. Bach panel is preferably rectangularin shape and provides a configuration of a large shallow pan.

Still referring to FIG. 2, the panel A includes a bottom wall 12,opposing side walls 14 and 16, and opposing end walls 18 and 20. The endand side walls are secured in conti-guous relationship and extendupwardly at right angles from the bottom wall to provide the shallow panconfiguration. An extending lip, indicated generally by the numeral 22,is integrally formed and rnay extend inwardly or outwardly from aplurality of sides of the panel. In the embodiment shown in FIG. 2, thelips extend entwardly from three sides of the panel and parallel to thebottom wall. The lip 22 includes a portion 24 integral With the end wall18, a portion 26 integral with side wall 14 and a portion 28 integralwith the end wall 20.

The panel B has a similar shallow pan configuration as panel A, having abottom wall 30, opposing end walls 32 and 34, and opposing side walls 36and 38. A lip portion 40 is integrally formed and extends outwardly fromthe end wall 32 and a similar lip portion 42 is integrally for-med andextends outwardly from the other end wall 34.

Panel C is of like configuration and includes a bottom wall 44, opposingend walls 46 and 48 and opposing side walls 50 and 52. Panel C does notprovide an extending lip portion.

The extending lip portions on the different panels, in conjunction withthe end walls and side walls of the panels, abut in mating side by siderelationship whereby connector members may be readily disposed over themarginal edges of the abutting lip portions and walls to secure theadjacent panels in rigid conductive contact.

Referring now more specifically to FIGS. 1 and 3, the panels A, B and Care formed to permit an overlapping mating engagernent of one panel withanother to increase rigidity and strength of the structure, to providegreater surfaee contact area for total sealing and conductivity betweencontiguous panels and, as previously mentioned, to present adjacentextending marginal edges for receipt of connector members to secure theadjacent panels togethe'r.

In FIG. 3, a three panel corner juncture of the isolation room isillustrated in perspective. The bottom wall 44 of panel C sets n the endwall 34 of panel B and the end wall 18 of panel A. Side wall 52 of panelC abuts the extending lip portion 42 of panel B and the end wall 46 ofpanel C abuts the extending lip portion 24 of panel A. In similarfashion, the bottom Wall 30 of panel B seats on the side wall 14 withside wall 38 of panel B abutting the extending lip portion 26 of panelA.

Referring now to FIGS. 2, 3 and 4, an angularly contoured contact member54, preferably formed from a thin strip of spring bronze, is disposedbetween abutting lip and Wall portions as shown between the bottom wall30 'of panel C and the end walls 18 and 20 of panel A and end walls 32and 34 of panel B. As readily seen in FIG. 4, the contact member 54 alsoextends up between the side and end walls of the C panels and the matinglip portions of the A and B panels. The contact member 54 insures totalsealing of the juncture between panels A and B with the panel C.

Referring now to FIGS. 1, 3 and 4, the abutting edges and lip portionsof the panels are securely held by connector members 56 received overthe marginal edges thereof and drawn tightly -against the abuttingsurfaces by a nut and holt combination passing through the combinedthickness of the side wall, lip and connector member.

Turning first to the juncture between the side panels A and B with thetop and bottom panels C, as best seen in FIGS. 3 and 4, a connectormember 56, preferably forrned from a metallic strip, proVides aninverted U confi-guration With the space between the leg portionssuflicient to be received over the combined thickness 0f the abuttingwall and lip portion of the adjacent panels. As seen in FIG. 1, theentire upper and lower periphery of the isolation room is.provided withtheccmnector members 56. In like manner, the intermediate connectionbetween two adjacent C panels is accomplished by a connector member 56.

The leg portions of the connector member 56, when secured over theextending marginal edges of the abutting surfaces of the panels extendsover one half of the total surface of the lip portions. A't Spacedintervals, securing members, such as a nut and holt combination, passthrough the legs of the connector rn'ember and are drawn together toclamp the abutting surfaces into solid, physical, conductiVe contact.

As readily seen in FIG. 3, the extreme ends of the connector members 56abut one another at the three panel corner junctures. T0 insure totalsealing of the room, a right angle cor'1nector member 58 is receivedover the abutting connector members 56 t0 cover the seam forrnedtherebe'tween. In similar manner, as best seen in FIG. 1, a T shapedconn'ector member 60 is received over the seam formed at theintersection of the connector members 56 securing the adjacent C panelsand the connector members 56 securing the C panels with the side panelsA and B.

The two panel co'rner junctures and the walls of the adjacent sidepanels A and B are secured by a connector member 62 having a U-shapedconfiguration, similar to the connector member 56, to be received overthe marginal edges of the abutting surfaces of the adjacent panels. T heconnector members 62 are proVided on each extremity with a flat armportion 64 which extends outwardly transverse to the leg portions of theU-shaped portions. The arm portion 64 is designed to lie flat againstthe lip portion of the panels adjacent the lower edges of connectormembers 56 as seen in FIGS. 1 and 3.

In securing a two panel corner jncture, the arm portion 64 is bent toform a right angle to perrnit one half of the arm to lie flat againstthe lip portion of panel A and the other half of the arm to lie flatagainst the lip portion of panel B as seen in FIG. 1. The connectormembers 62 are secured by passing securing members such as a holt andnut cornbination through the arm 64 and the abutting surfaces of thepanels.

Itis now readily Understo0d that every seam formed by abutting walls andlip portions of the adjacent panels are covered by a connector memberand seams formed by the connector members are in turn covered byadditional connector members making the entire enclosure sealed fromwave emanations.

lt is also readily understood that the connector members, in addition toclamping and securing the abutting surfaces of the panels intoconductive contact, serve as a reinforcement of the structure .byproviding additional strength at the seams and the corner junctures.

Referring now to FIGS. 5 and 6, the isolation room 10 is constructedfrom three basic or standard prefabricated panel types A, B and C. Asbest seen in FIG. 6, the panels A, B and C are substantially identicalin configuration, varying only in their positioning and relationship ofintegrally formed lip portions which in this embodiment extend inwardlyand parallel to the bottom wall 12 from the side er end walls.

An inwardly extending lip is contiguously formed on three of the wallsof panel A. A lip portion 24 extends inwardly from end wall 18, a lipportion 26 extends inwardly from end wall 20. Panel B has an inwardlyextending lip 35 on the side Wall 36 and panel C does not have anyextending lip portions.

Preferably, the lip portions of all the panels are securely bonded, suchas by brazing, to the adjacent side and end Walls in a manner wherebythe upper surfaces of the lip portions are at the Same elevation as theupper marginal edges of the side and end Walls.

The inwardly extending lip portions on the diflerent panels, inconjunction with the end walls and side Walls of the panels, abut inmating side by side overlapping.relationship When assembled and receiveconnector mernbers over their marginal edges to secure the adjacentpanels in rigid conductive contact. The panels A, B and C are preformedto permit an overlapping mating engagement of one panel with another toincrease rigidity and strength of the structure, to provide greatersurface contactarea for total sealing and conductivity betweencontiguous panels and, as previously mentioned, to present adjacentmarginal edges 015 the lip portions and walls for receipt of connectormembers to secure the adjacent panels together.

As best seen in FIGS. 7 and 8, the adjacent abutting panels areillustrated in their secured position. A connector member 56, preferablyformed from a metallic strip, provides a U configuration With a spacebetween the leg portions suflicient to receive the combined thicknass ofthe abutting Walls and lip portions of the adjacent panels and anycontact member 54 (not shown in FIGS. 7, 8 and 9) that may be used 10close the joint. The leg portions of the connector member 56, When inposition, extend over substantially the entire surface area of theabutting surfaces. Although the dimensional distance between the legs ofthe connector member 56, relative to the combined thickness of theabutting lip portions and Walls of the panels, permits frictionalsecurement of the connector member in position, the connector member isfurther secured in position by a plurality of spaced apart fastenermembers 58, illustrated in the drawingsas a conventional nut, holt andwasher combination. When the fastener members 58 are drawn tight, theconnector member 56' securely clamp the total abutting surfaces of theextending lip portions and Walls in a tight sealing surface to surfacerelationship. All cf the seams formed by the multiple contiguous panelsare completely covered by the connector mernbers and the abuttingsurfaces are securely held in surface to surface contact to provide asolid leakproof enclosure. i

Referring now specifically to FIG. 9, one cf the eight, three panelcorner junctures of the isolation room is illustrated in perspective.The bottom Wall 12 of the A panel is positioned on the floor orfoundation (not shown) with the end and side Walls extending upwardly. AB panel is positioned adjacent the end Wall of the A panel whereby theend Wall 34 of the B panel seats on the upper surface of the inwardlyextending lip portion 28 of the A panel. In this position the outersurface of the bottom Wall 12 of the B panel Will be flush with the endwall 20 of the A panel and will be disposed at right angles t0 thebottom Wall 12 of the A panel. A C panel is then positioned adjacent theside wall 16 of the A panel and the side wall 36 of the B panel wherebythe end Wall 46 of the C panel Will seat on the upper surface of theinwardly extending lip portion 26 of the A panel and the side Wall 50 ofthe C panel will abut the outer surface of the inwardly extending lipportion 35 of the B panel. In this position, the outer surface of thebottom Wall 44 of the C panel Will be flush With side Wall 16 of the Apanel and the side Wall 36 of the B panel and is disposed at rightangles to the bottom Wall 30 of the B panel and the bottom wall 12 ofthe A panel.

As previously described, a connector member 56 is positioned over themarginal edges of the abutting lip portions and Walls and receives thefastener members 58 at spaced intervals to Securely clamp the abuttingsurfaces relationship.

Referring now to FIGS. 7 and 9., the extreme corner portions of thepanels, although in surface to surface contact once the connectormembers 56' are fastened in position, are further secured to one anotherby a fastener member 60, illustrated as*a holt and nut combination inconjunction With a pair of opposing large washer members 61. Once thefastener members 60 are drawn tight and the connector members 56' are inposition, the total surface area of all abutting surfaces of the panelforming the room are in a solid leakproof relationshijw, electricallyisolating the interior 0f the room. When the entire room is assembledand secured as just described, the outer surface of the room, as bestseen in FIG. 5, is completely smooth With only the hairline seams formedby the adjacent panels being visible.

Referring now to FIG. 10, When the span of an individual panel becomestoo large, the planar surface of the panel may require reinforcement.Several well known conventional panel reinforcement concepts may beemployed but it has been found that a thin strip of metal 16, having atriangular configuration, as shown, and bonded to the outer surface ofthe panel provides excellent economical reinforcernent for the panels.

What is claimed is:

1. An electrical isolation room comprising:

a plurality of preforrned panels, each of said panels having a centralrectangular portion and metal shielding presenting marginal flangesabout the peripheral edges thereof extending outwardly away from thecentral portion,

said panels being positioned With adjacent central portions adjacent oneanother and With their marginal flanges coterminous at their outer edgesand their interfaces in engagement with one another in pairs, and

-interengagement means between the flanges including spring elementsbetween said interfaces following the contour thereof, and

metal connector members extending around and bridging the coterminousedges in electrically shielded relationship to engage the remote facesof the flanges, and

means interengaging said members for securing the panels in supportedelectrical conductive contact With each other.

2. An electrical isolation room comprising:

a plurality of preformed panels of metal shielding, each of said panelshaving a central rectangular portion having marginal flanges about theperipheral edges thereof extending at right angles to the centralportion,

said panels being positioned with the central portion of one paneladjacent the central portion of an adjacent panel,

said marginal flanges of adjacent panels having lip portions parallelWith the central portions of their respective adjacent panels disposedin face-to-face contact with marginal flanges 011 the central portionsof each abutting panel,

said flanges and lip portions contacting one another being coterminousat their outer edges with one another in pairs,

interengagement means between the flanges including electricallyconductive elements between said pairs of contacting flanges and lipportions over a portion of their interface area,

metal connector members extending around and bridging the coterminousedges in electrically shielded relationship to engage the remote facesof the flanges, and

means interengaging said members for secun'ng the panels in supportedelectrical conductive contact with each other.

3. An electrical isolation room constructed from a plurality of threebasic preformed sheet metal panel configurations,

each of said panels having rectangular central portions of sheet metalintegrally bordered at each edge with an upstanding flange disposed at aright angle to the central portion,

one of said panels having coplanar flanges extending beyond two oppositeupstanding 'flanges and terminating in marginal edges anotherof saidpanels having coplanar flange extending beyond three of its upstandingflanges and terminatir'1g in marginal edges said last two mentionedpanels being positioned adjacent to the remaining panels with adjacentedge portions cf their central portions adjacentthecentral portions ofsaid remaining panels and their coplanar flanges in face-to-faceengagement with said upstanding flanges, respectively, at the corners ofsaid room, and

connector members disposed around the marginal edges of the face-to-faceengaging flanges tosecure the panels in electrically conductiveshielding contact.

4. An electrical isolation room constructedfrom a plurality of threebasic preformed sheet metal panel.configurations,

each of said panels having rectangular centralportions of sheet metalintegrally bordered at eachedge with an upstanding flange disposed.at aright angle to the central portion,

one of said panels having coplanar flanges extending from two oppositeupstanding flanges Sand terminating in marginal edges another of saidpanels having coplanar.flanges extending from two contiguous upstandingflanges and terminating in marginal edges said last two mentioned panelsbeing positioned adjacent to the remaining panels with adjacent edgeportions of their central portions abutting edge portions of upstandingflanges of said remaining panels and their coplanar flanges inface-to-face engagement With said upstanding flanges, respectively, atthe corners of said room, and

connector members disposed around the marginal edges of the face-to-faceengaging flanges to secure the panels in electrically conductiveshielding contact.

5. An electrical isolation room cf sheet metal comstructed from aplurality of three basic preformed .panel configurations securedtogether in contiguous relationship comprising first .panelconfiguration havinga bottom wall, parallel side walls, parallel endwalls and lip portions integrally formed at right angles t o said endwalls and one of the side Walls;

a second panel configuration having a bottom wall,

parallel end walls,parallel side walls and a lip portion integrallyformed at right angles on each of said end walls;

a third panel configurationhavinga bottom wall, parallel side walls andparallel end walls,

said panels being disposed in contiguous relationship 10 form the room,said lip portions of the first and second panels beind disposed infaCe-tO-faCe relationship, with side and end walls .of anot her panel atthe corners of the room, and

connector members extending 1 ;he length of said lip portions enclosingthe marginal edges of.the faceto-face walls and lip portions to securethe panels in electrical conductive relationship.

-6. An electrical room constructed from a plurality of sheet metalpanels, having three basic preformed panel configurations of metallicshielding secured t ogether in contiguous relationship comprising vfirst panel configuration having a bottom Wall, parallel side walls,parallel end walls and'lip portions integrally forme d at right anglesto said end walls and one of theside walls;

a .second panel configuration having a bottom-wall,

parallel end walls, parallel side wallsand a lipportion integrallyformed at right angles on each 10f said end walls;

a third panel configuration having a bottom Wall, parallel side wallsand parallel end walls,

said panels being disposed marginally in contiguous relationship withextended marginal edges of adjacent lip portions,

- side walls and end Walls in side-by-side relationship,

a U-shaped connector member disposed over theadjacent extending marginaledges and .a holt and nut clamp arrangement at spaced intervals throughsaid connector member to secure the panels in solid electricalconductive relationship,

vsaid lip portions on one panel beingdisposed=in face-tofacerelationship with a parallelwall ontwo-other panels and with a marginalportion of the bottom wall of said two other panels:engaging 'theparallel =walls having the lip portions thereon to providetwo areas ofcontact at each lipdisposed at a right angle to each other.

7. The combination called.for in claim 56 including a spring elementintermediate the walls and portionsdisposedin face-to-face relationshipfollowing in partlthe right angle eharacter cf said two areas.

- 8. Anelectrical isolation room constructedfrom aplu- .rality of threebasic preformedsheet metal:panel Configurations secured together incontiguous vrelationship comprising:

first panel configuration having a bottom wall having parallel sidewalls, parallel end Walls and lip portions integrally formed at rightangles t0 said end walls and one of the side Walls,

second panel configuration having a bottom Wall,

having parallel end walls, parallel side walls and a lip portionintegrally formed at right angles to said end walls, the bottomwall ofone of said second panel eonfigura'tions having spaced apertures'therethrough,

a third panel co'nfiguration having a bottom Wall having:spacedaperrures therethrough, parallel side walls and parallel end walls saidpanels being disposed in marginally contiguous relationship withextended marginal edges of adjacent lip portions, side walls and endwalls in side-by-side relationship to define plural areas cf contacttherebetween disposed at right angles to one-another at saidside-by-side relationship and U-shaped connector members disposed overand enclosingthe extending adjacent marginal edges to secure the panelsin wholly sealed electrical conductive relationship.

9. Anelectrical isolation room comprising:

a plurality of three basic types of preformed sheet mefal panelconfigurations each having contiguous sideand and end walls extendingupwardly therefrom normal to and at the edges of a central flatportionthereof,

two of said panels presenting coplanarlip portions. ex-

tending towards one another from thewalls to define a space betweenthern and the central portion,

said panelsbeing positioned adjacent to one another in edge contiguousrelationship with the lip portionsand walls in overlapping face-to-faceabutting relationship, and

U-shaped connector members disposed over abutting extending lip portionsand walls of adjacent panelS and extending the length t. hereof, and

clamping means accessiblein part*through said space and extendingthrough the sides of theconnectr members and ab11tng lip p0rtions andwalls for clamping same tightly together to seCure the panels intoelectrical conductive contact.

10. An electrical isolation room compri-sing:

a plurality of three basic types cf preformed panels and disposed overand enclosing the marginal edges of the abutting lip portions toobstruct exit of interference waves entering between said face-to-facerelationship, side and end Walls, and

configurations secured together in contiguous relaa holt and nut-arrangement at spaced inte-rvals through tionship including, saidconnector mernber and abutting lap portions,

a first panel configuration having a bottom wall, paralside and endWalls to secure in clamped relationship le1 side Walls, parallel endWalls and an inwardly the panels in solid electrical conductiverelationship. extending lip portion forrned 011 one of said side 12. Anelectrical isolation room constmcted frorn a Walls overhanging thebottom Wall in parallel spaced plurality of three basic preformed panelconfigurations relationship therewith; formed from a single sheet ofsolid metallic sheet shielda second panel configuration having a bottomWall, ing secured together in contiguous relationship comprisparallelend Walls and parallel side Walls; ing:

a third panel configuration having a bottom Wall, parala first panelconfiguration including a bottom Wall havlel side Walls, parallel endwalls, and coplanar lip ing contiguous parallel end Walls and parallelside portions formed on said end Walls and one of the Walls about theperiphery thereof and a lip p0-rtion side walls and extending towardsone another, integrally formed inwardly at right angles or1 the saidpanels being disposed in marginally contiguous upper edge of one of saidside Walls above and spaced relationship with extended marginal edges ofadjafrom said bottom Wall; cent lip portions, side Wall-s and end Wallsin facea second panel configuration including a bottom Wall to-facecontacting relationship, having contiguous parallel side Walls andparallel end U-shaped connector members extending the length of Walls,

and disposed over the extending adjacent marginal a third panelconfiguration including a bottom Wall havedges, means engaging oppositesides of t=he U-shaped ing contiguous parallel side Walls and parallelend connector rnember clamping same against said con- Walls, tacting lipportions and Walls in pressure contacting a fl1ird panel configurationincluding a bottom Wall havrelationship to secure the panels inelectrical conducing contiguous parallel side walls and parallel endtive relationship. Walls about the periphery thereof and lip portions11. An electrical isolation room constructed from a integrally formedinwardly at right angles 011 the plurality of three basic preformedpanel configurations upper edge of said end Walls and one of the sideforrned -frorn a single sheet of metallic shielding secured Walls;together in continuous relationship c-omprising: said panels di-sposedadjacent to one another with the a first panel configuration including abottom Wall havlip portions,

ing contiguous parallel end Walls and parallel side said Walls and endWalls being in abutting side by side Walls about the periphery thereofand a lip portion relationship, formed at right angles spaced above saidbottom wall an elongated metallic U-shaped connector m6mber dis- 0n theupper edge of one cf said side Walls; posed over the extending marginaledges and suba second panel configuration including a bottom Wallstantially covering the total surface of the abutting having contiguousparallel side walls and parallel lip portions, side and end Walls, andend Walls about the periphery thereof; 40 a holt and nut arrangementdisposed at spaced intervals a third panel config-uration including abottom wall through said connector rnember and said abutting havingcontiguous parallel side Walls and parallel end lip portions, side andend Walls in a direction paralwalls about the periphery thereof andcoplanar lip t0 the adjacent bottom Wall to rigidly secure the portionsformed to extend towards one another at panels in solid electricalconductive relationship. right angles on the upper edge of said endWalls and 0ne of the side Walls; N0 references cited.

said panels disposed adjacent to one another with the lip portions, saidwalls and end Walls in abutting JOHN BURNS, Prlmary Emmmerface-to-facerelationship, DARRELL L CLAY, Examiner a U-shaped connector memberextending the len gth of

3. AN ELECTRICAL ISOLATION ROOM CONSTRUCTED FROM A PLURALITY OF THREEBASIC PREFORMED SHEET METAL PANEL CONFIGURATIONS, EACH OF SAID PANELSHAVING A RECTANGULAR CENTRAL PORTIONS OF SHEET METAL INTEGRALLY BORDEREDAT EACH EDGE WITH AN UPSTANDING FLANGE DISPOSED AT A RIGHT ANGLE TO THECENTRAL PORTION, ONE OF SAID PANELS HAVING COPLANAR FLANGES EXTENDINGBEYOND TWO OPPOSITE UPSTANDING FLANGES AND TERMINATING IN MARGINAL EDGESANOTHER OF SAID PANELS HAVING COPLANAR FLANGE EXTENDING BEYOND THE THREEOF ITS UPSTANDING FLANGES AND TERMIANTING IN SAID MARGINAL EDGES SAIDLAST TWO MENTIONED MEANS BEING POSITIONED ADJACENT TO THE REMAININGPANELS WITH ADJACENT EDGE PORTIONS OF THEIR CENTRAL PORTIONS ADJACENTTHE CENTRAL PORTIONS OF SAID REMAINING PANELS AND THEIR COPLANARFLANAGES IN FACE-TO-FACE ENGAGEMENT WITH SAID UPSTANDING FLANGES,RESPECTIVELY, AT THE CORNERS OF SAID ROOM, AND CONNECTOR MEMBERSDISPOSED AROUND THE MARGINAL EDGES OF THE FACE-TO-FACE ENGAGING FLANGESTO SECURE THE PANELS IN ELECTRICALLY CONDUCTIVE SHIELDING CONTACT.